Explicit Enhancement Options 

·        There are two types of explicit enhancement options: Source code enhancements with source code plug-ins and BAdIs:

·        Explicit enhancement options of the source code enhancement type allow you to insert source code plug-ins. These are lines of code that are executed if the source code enhancement option is inserted in the code with the Enhancement Point command. Source code enhancement options with the Enhancement Section command behave the same, except that the source code plug-in replaces the section in the original code. Therefore, you are not only able to enhance the original code, but can also flag specific code sections (as enhancement sections) so that other developers can replace these sections with other code without making modifications.

·        Business Add-Ins (BAdIs) are “hangers” for object plug-ins. A BAdI definition comprises an interface with methods. BAdIs are enhanced by classes that implement the BAdI interface. If you instantiate a BAdI and then call its methods, you can, among other things, specify which method implementations are to be carried out on the basis of filter values. In other words, a BAdI method call is a dynamic method call with a specified interface, for which it is not determined until runtime which method implementations are to take place.

In the case of source code enhancements, the definition and call coincide. You define BAdIs once in the BAdI Builder and can then call them at different points in the various compilation units.